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  1. bpelec

    Inertia units conversion

    But I take your point... :)
  2. bpelec

    Inertia units conversion

    2kg, and I interpret that as mass... If I climb up a mountain then it's weight will be different...
  3. bpelec

    Inertia units conversion

    I am based in the UK and last time I checked, SI units were all metric: http://physics.nist.gov/cuu/Units/units.html Also, I have never come across Kgf or Kgfs before.. What is the 'f'? Ok, just found it on Wikipedia, but I have never come across Kilogram-Force before, and I work in a...
  4. bpelec

    Inertia units conversion

    Thank you for all for your help and especially to swearingen for such a clear explanation! Kind regards, BPELEC.
  5. bpelec

    Inertia units conversion

    I feel as though this may have been explained before, but my searching was not successful. My apologies if I have missed the answer... I am an electrical engineer struggling with the units of inertia. I have a specification that states that the inertial load is 0.65 lb-in-sec^2. I can't think...
  6. bpelec

    What is destructive charge voltage?

    Great, thank you both for your help!
  7. bpelec

    Multi Voltage from Series Batteries

    Absolutely, although if you are adding an extra battery then you may also consider running your 7.4 volt system separately using that 4th battery, and having two distinct battery systems (as you suggested originally).
  8. bpelec

    Multi Voltage from Series Batteries

    Here's a sketch of what I was suggesting... http://files.engineering.com/download.aspx?folder=882ae840-7d25-4ad4-8dc2-955146d653a0&file=circuit.jpg
  9. bpelec

    Multi Voltage from Series Batteries

    You could not wire all three batteries in series and parallel at the same time, even with different loads. The necessary interconnections between the batteries would short them out I think... However, you could wire the three batteries in series and take 7.4 volts off one of them to a different...
  10. bpelec

    What is destructive charge voltage?

    Just to add that "destructive charge voltage" is a translation from the original Italian, which was "Tensione di scarica distruttiva". BPELEC.
  11. bpelec

    What is destructive charge voltage?

    I have a specification for a 28V DC system that includes the following: ------------------------------ Insulation Resistance: - greater than 100 Mohm with 95% rel. humidity - greater than 1000 Mohm with 50% rel. humidity Dielectric strength - greater than 450 V Destructive charge voltage -...
  12. bpelec

    How to test a USB2 cable with a BERT (bit error rate tester)?

    Just wanted to add that I am thinking that the BER bath-tub might be the key, but I only partially understand that at the moment...
  13. bpelec

    How to test a USB2 cable with a BERT (bit error rate tester)?

    We have what can be best described as a usb 2 cable of questionable quality. We want to use a bit error rate tester to decide whether or not this cable is up to the job of supporting high-speed USB 2 data (480 Mbit). I am aware there are other ways of checking the performance of the cable, but...
  14. bpelec

    Finding a Manufacturer's PSPICE model for an optocoupler

    Thank you for your post. The optocoupler sits in the output voltage feedback path, after the compensator. It is there to provide isolation between the output of the dc-dc converter and the control chip. Am I right in thinking that you are suggesting taking the information from the datasheet of...
  15. bpelec

    Finding a Manufacturer's PSPICE model for an optocoupler

    We are very close to completing an OrCAD PSPICE simulation for a two-switch forward dc-dc converter, and are only missing the optocoupler. I am now looking for a manufactuer's PSPICE model of an optocoupler with a bandwidth of at least 1 Mhz. So far I have looked through National, Texas...
  16. bpelec

    What would you want to see in a specification for a dc-dc converter?

    Great stuff! Thank you all.
  17. bpelec

    What would you want to see in a specification for a dc-dc converter?

    Yes, a good idea ScottyUK, and thank you for the suggestions. Best regards, BPELEC.
  18. bpelec

    What would you want to see in a specification for a dc-dc converter?

    Input: 26-30 Vdc Output: 28 Vdc @ 5amps The converter must use a transformer, and the primary and secondary sides are therefore isolated.
  19. bpelec

    What would you want to see in a specification for a dc-dc converter?

    If you were a customer, buying a custom made dc-dc converter for an application, what information would you want to see in an outline specification? By "outline specification", I mean the kind of thing that would come along with a quote, before a final system design had been agreed. I am...
  20. bpelec

    Removing spikes from low-voltage supply voltage in a dc-dc converter

    Thank you macgyvers2000. In your post, you mention that in my design there are a few points where I would not want to connect the ground together... In your opinion, where would these points be? Thanks again everyone! I am learning a lot from all of your post. I haven't had a good humbling...

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